Objective:
Backgrond
The following picture is the visualization of the summary table of the average volume of the ISSR of each longitude for one year. The table contains the longitude ID and the average volume of the ISSR. The longitude ID ranges from 1 to 150 which represents the higher the value of the longitude ID, the closer the area to the East. Again, it shows the trend of the average volume of the ISSR from the West to the East area in one year. According to the following picture, it shows there is a decrement of the average ISSR volume in the middle area between the East and the West area.
The cleaned data is the csv files with only ISSR cell records since the volume of ISSR is only related to ISSR cells. Therefore, the size of the cleaned data is reduced to 1.21GB from 50GB.